/Engine/Source/Editor/UnrealEd/Classes/Editor/EditorEngine.h
struct FPreviewPlatformInfo
bool
bPreviewFeatureLevelActive
Is feature level preview currently active
FName
DeviceProfileName
The device profile to preview.
ERHIFeatureLeve...
PreviewFeatureLevel
The feature level we should use when loading or creating a new world
FName
PreviewPlatformName
The the platform to preview, or NAME_None if there is no preview platform
FName
PreviewShaderFormatName
The shader Format to preview, or NAME_None if there is no shader preview format
FName
PreviewShaderPlatformName
Preview Shader Platform Name
EShaderPlatform
ShaderPlatform
The ShaderPlatform to be used when in preview